Clean up "Hacked" CSS

There was no need to over complicate the 'hacked' CSS to use the
bounce.js library.

By simply hiding the div to begin, then showing it on mouse over you
will get the desired effect without the "jitter" that is a pain in the
video!

Timing, etc. can be adjusted as needed to get the desired effect, but this leaves the CSS far cleaner which is a definite plus! 
These settings have been changed on my local machine, simply because I am running the more updated version of Jekyll which unfortunately does not support this syntax in SASS. 

Figured, if you choose to use this pull-request, that you could use this as a talking point. It may be that someone doing this on their own accord is better off creating their settings file in SASS; or there may be other work-arounds/plugins which I'm not familiar with. Either way, this is required out of the box to make the site work in Jekyll 2.1.1